VLOOKUP with a WEEKDAY lookup value

Hi, unsure if I'm going about this the wrong way.
I'd like to SUM a column where the first column has a certain day. The first column is stored as a date, although displays as a day using the Number format of 'dddd', and the values I need to SUM are displayed in different columns depending on the time of day. I thought a VLOOKUP would work so that I could determine which column I need to SUM, but I cannot get the day bit to work.

My hope was:
=SUM(VLOOKUP(2,August!A5:R35,16))
My problem is I don't know how to make the '2' bit be a weekday value. My understanding of VLOOKUP is basic, so small words would help

Am I going about this the wrong way? I've attached a sample workbook. In my real example, the only sheet I'll be able to change is the "Analysis" one as it will be in an external workbook.

Cell F10 in Analysis is my play cell.

Any suggestions, even if the suggestion is "don't use VLOOKUP" would be greatly appreciated.

DoorStats_2015.xlsx

Hi,

See the attached file.

I have added a helper column to separate the WEEKDAY and used SUMIF to get the total.

In F10:

=SUMIF(August!B5:B35,4,August!Q5:Q35)

You can use this formula in F10:

=SUMPRODUCT(--(TEXT(August!$A$5:$A$35,"ddd")=F$2),August!$R$5:$R$35)

although it will return zero as there are no values for Mondays. Copy it across to J10, and you will see the total for Friday. You can use the formula for the other months (i.e. copy it up and down), but you will need to change the name of the month on each row as appropriate.

Hope this helps.

Pete

Originally Posted by Pete_UK

=SUMPRODUCT(--(TEXT(August!$A$5:$A$35,"ddd")=F$2),August!$R$5:$R$35)

Pete, that's great! Thanks. I wondered about the SUMPRODUCT function but wasn't particularly aware of how it worked. So it's basically saying "look for a text version in "ddd" form of F2" (which is the day of the week I want) and return the values in the R column? I can use this for so many things. Thanks so so much!

cbatrody: I had a look at your solution too and it works well, unfortunately I cannot edit the source tabs so cannot add a hidden helper column Thanks though.

You're welcome - thanks for marking the thread as SOLVED.

Also, you might like to know that you can directly thank those who have helped you by clicking on the small "star" icon located in the lower left corner of a post that you have found to be helpful (not just in this thread - for any post that has helped you). This also adds to the reputation of the poster (the small green bars in the poster's profile).

Pete